Question about 1991 Mercedes-Benz 420
Mercedes 420sel. 1986 126 serie
Running idle at 700/1000rpm. which speed I find too fast. Under 500rpm I think is more ideal.
What is your advice and solution pls
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Posted on Jan 02, 2017
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Nov 09, 2013 | 1991 Mercedes-Benz 420
Sep 20, 2013 | Cars & Trucks
Apr 12, 2013 | Cars & Trucks
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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